public IEnumerator Playing_IsBirdFlyingWhenRunFlying()
        {
            GameManager._instance.SetState(SystemDefine.EGameState.Playing);
            bird.Flying();
            bird.Flying();
            bird.Flying();
            bird.Flying();
            yield return(null);

            yield return(null);

            yield return(null);

            Assert.AreNotEqual(BirdManager._instance.GetBirdFirstPos(), bird.GetBirdPos());
        }